I am a college professor who uses My Math Lab.I also love amazon and their customer service. For a few semesters, mainly 2010-2011 while Pearson was making updates codes did not work. MY code would not even work. We, too, went through the rigamaroe with Pearson that the college was selling invalid codes, blah, blah. If you bought online with a credit card you were good to go but access codes were all saying invalid. The sad part is as far as I know, Pearson NEVER owned up to the problem being their fault. My students and I were able to finally access MML thanks to a Pearson rep who gave me a back door code.
By
M. Loghry "matheduc8tor"